>I was able to create an exe fine a few months ago. I recently added another form and table. Every form in the system has the app_mediator. I also changed pcs and reinstalled VFP6. Now when I recreate the exe and click on any form with the app_mediator, I get the error message.

Drat. Did you reapply service pack 3? (that's a certified WAG, BTW :)